Reading ISN code is for key programming and writing ISN code is for engine control module replacement. In this post we will show a guide to read and write ISN for BMW chassis E series using Autel MK808TS, please note that this device can’t read ISN code from every BMW, need to check the device prompt.
1. Read ISN code
Step 1: Connect Autel MK808TS with car via OBD port, enter car model “BMW”, select “system mode”.
Step 2: Choose “engine system”, ensure the engine is turned off.
Step 3: Identified the current engine model, enter the engine system….
Step 4: Select “read ISN”, start to read ISN, please wait…
Step 5: Read ISN success, take a photo or screenshot to record the ISN. (Some engine’s ISN may be 2 bytes which is normal)
2. Write ISN code
Step 1: In engine menu, select “write ISN”.
Step 2: There is a risk in writing the engine ISN code. The written ISN code needs to match the vehicle, otherwise some functions will not work properly. Please proceed with caution!
Step 3: After entering the ISN code that matches the vehicle correctly, click "OK" and the system will automatically write the new ISN code.
Step 4: Write engine ISN success.
DISCLAIMER: The technology and software in the blog are only used for technical research and auto repair, and are not allowed to be used for illegal purposes, We will not be responsable for any direct and indirect damages from the use of the file created by this page.